Disconnect: Server uses different class tables.

I got this error this morning when I wanted to join the server I usually play on. After some google time, I found out that its usually related to some client/server update conflict.
But how can this happen on 10 different servers I try to join?
Tried restarting my pc, removing all addons, reinstalling the whole game from scratch, validating files… No changes. Any ideas? last night, everything was fine without any problems.

Same error, its due to server being updated. ive updated but same.

If you are on Dev beta version, opt out of it.

How does one do that

[editline]28th January 2014[/editline]

Oh i did it, thankyou!